MUL-8287: docs(changelog): release 0.7.1 (#9593)

* docs(changelog): release 0.7.1

Co-authored-by: multica-agent <github@multica.ai>

* docs(changelog): retitle 0.7.1 and tighten wording

Co-authored-by: multica-agent <github@multica.ai>

---------

Co-authored-by: multica-agent <github@multica.ai>

docs(changelog): add v0.6.4 release entry (2026-10-20) (MUL-8099) (#9353

)

Co-authored-by: multica-eve <273080382+multica-eve@users.noreply.github.com>
Co-authored-by: multica-agent <github@multica.ai>

Release v0.6.2

Release v0.6.1

Release v0.6.0

Release v0.5.3

Release v0.5.2